Cutting Tools

Abstract

A cutting tool according to an embodiment of the present disclosure comprises a main body portion arranged in a machining space of a machine tool, a sensor provided in the main body portion, a wireless communication circuit that transmits the output of the sensor, and a first power receiving antenna circuit that receives power supply radio waves transmitted from a power transmitting antenna provided in the machining space and outputs power.

Description

[Technical field]

[0001] The present disclosure relates to cutting tools. [Background technology]

[0002] Patent Document 1 discloses a cutting tool including a main body, a sensor disposed in the main body, a wireless communication unit that transmits information indicating the output of the sensor to the outside, and a battery that supplies power to each of the components. The battery is accommodated in a battery housing, which is a space provided in the main body. This cutting tool is capable of monitoring the state of the cutting tool during machining using a sensor and transmitting the state to the outside. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2022 / 230149 Summary of the Invention

[0004] A cutting tool according to an embodiment of the present disclosure comprises a main body portion arranged in a machining space of a machine tool, a sensor provided in the main body portion, a wireless communication circuit that transmits the output of the sensor, and a first power receiving antenna circuit that receives power supply radio waves transmitted from a power transmitting antenna provided in the machining space and outputs power. [Brief description of the drawings]

[0005] [Figure 1] FIG. 1 is a diagram showing an overall configuration of a cutting system in which a cutting tool according to an embodiment is used. [Diagram 2] FIG. 2 is a functional block diagram showing an example of the configuration of the cutting tool according to this embodiment. [Figure 3A] FIG. 3A is a diagram showing the appearance of a cutting tool. [Figure 3B] FIG. 3B is a cross-sectional view taken along line BB in FIG. 3A. [Figure 4]FIG. 4 is an enlarged view of a main part of FIG. 3A. [Diagram 5] FIG. 5 is an enlarged view of a main part of FIG. 3B. [Figure 6] FIG. 6 is a diagram showing the circuit board and the rectenna when viewed from the front in the Z2 direction. [Figure 7] FIG. 7 is a block diagram showing a part of a cutting tool according to a modified example. [Figure 8] FIG. 8 is an external view showing a part of a cutting tool according to this modified example. [Figure 9] FIG. 9 is a cross-sectional view showing a part of a cutting tool according to this modified example. [Figure 10] FIG. 10 is an external view showing a part of a cutting tool according to this modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0006] [Problem that this disclosure aims to solve] In the cutting tool having the above-mentioned conventional sensor, when the battery power is consumed and depleted, it is necessary to replace the battery with a new one. In this case, the old battery must be removed from the battery housing and a new battery must be installed, and it is difficult to replace the battery during processing. Therefore, if the processing time becomes long and the battery power runs out during processing, there is a risk that it will not be possible to monitor the state of the cutting processing thereafter. Even when the machining time is long like this, it is desirable to appropriately monitor the state of the cutting process.

[0007] [Effects of this disclosure] According to the present disclosure, the state during processing can be appropriately monitored.

[0008] First, the contents of the embodiment will be listed and described. [Overview of the embodiment] (1) A cutting tool according to an embodiment of the present disclosure comprises a main body portion disposed in a machining space of a machine tool, a sensor provided in the main body portion, a wireless communication circuit that transmits an output of the sensor, and a first power receiving antenna circuit that receives power supply radio waves transmitted from a power transmitting antenna provided in the machining space and outputs power.

[0009] According to the above configuration, since the cutting tool has a first power receiving antenna circuit that receives radio waves for power supply transmitted from a power transmitting antenna provided in the machining space, wireless power supply is possible in the machining space. Therefore, the cutting tool can receive power even during machining, and the sensor output can be transmitted continuously even if the machining time becomes long. As a result, the state of cutting processing (state of the cutting tool) during machining can be appropriately monitored.

[0010] (2) The cutting tool according to (1) above may further include a power storage unit that stores the electric power. In this case, even if the radio waves for power supply from the power transmitting antenna are temporarily cut off or temporarily unable to be received, the transmission of the sensor output can be continued using the power stored in the power storage unit.

[0011] (3) In the cutting tool of (1) or (2) above, when the main body portion includes a cutting tip and a rod-shaped shank to whose end the cutting tip is attached, the sensor, the wireless communication circuit, and the first receiving antenna circuit may be arranged on the shank from the end side along the longitudinal direction of the shank in the order of the sensor, the wireless communication circuit, and the first receiving antenna circuit. In this case, the sensor can be placed closest to the cutting tip, which is the processing point, and the sensitivity can be improved. Also, the first power receiving antenna circuit is not placed between the sensor and the wireless communication circuit, and the sensor and the wireless communication circuit can be placed relatively close to each other. As a result, the distance of the line that transmits the output of the sensor to the wireless communication circuit can be shortened, and the noise resistance can be improved.

[0012] (4) In the cutting tool of (3) above, when the shank has a recess opening on a side of the shank and a lid covering the opening of the recess, the wireless communication circuit and the first power receiving antenna circuit may be housed in a storage space defined by the recess and the lid. In this case, the wireless communication circuit and the first power receiving antenna circuit can be disposed on the shank without being exposed to the outside.

[0013] (5) In the cutting tool described above in (4), the cover may be made of a material that is permeable to radio waves transmitted and received from the wireless communication circuit and to radio waves for power supply. In this case, it is possible to prevent the cover from interfering with the transmission and reception of radio waves of the wireless communication circuit and the reception of radio waves for power supply.

[0014] (6) In the cutting tool of (5) above, when the wireless communication circuit has a transmitting and receiving antenna and the first power receiving antenna circuit has a power receiving antenna, the power receiving antenna and the transmitting and receiving antenna may be arranged opposite the cover portion. In this case, transmission and reception of radio waves from the wireless communication circuit and reception of radio waves for power supply can be properly performed through the cover.

[0015] (7) In the cutting tool of (4) above, the cover portion may include a window portion that communicates the storage space with the outside, and a window cover that covers the window portion and is made of a material that is permeable to radio waves transmitted and received from the wireless communication circuit and radio waves for power supply. In this case, it is possible to prevent the window cover from interfering with the transmission and reception of radio waves from the wireless communication circuit and the reception of radio waves for power supply.

[0016] (8) In the cutting tool of (7) above, when the wireless communication circuit has a transmitting and receiving antenna and the first power receiving antenna circuit has a power receiving antenna, the power receiving antenna and the transmitting and receiving antenna may be arranged opposite the window cover. In this case, radio waves from the wireless communication circuit and radio waves for power supply can be appropriately transmitted and received through the window cover.

[0017] (9) In the cutting tool described above in (8), the power receiving antenna and the power transmitting / receiving antenna may be disposed adjacent to each other. In this case, the window portion and the window cover can be made relatively small.

[0018] (10) In any one of the cutting tools (1) to (9) above, the cutting tool may further include a second power receiving antenna circuit that receives power supply radio waves transmitted from a power transmitting antenna provided in the machining space and outputs power, and a combining circuit that combines the power output by the first power receiving antenna circuit and the power output by the second power receiving antenna circuit. In this case, by making the receiving frequency band of the first power receiving antenna circuit and the receiving frequency band of the second power receiving antenna circuit different, it is possible to receive power supply radio waves of two different frequency bands. Furthermore, if the receiving frequency band of the first power receiving antenna circuit and the receiving frequency band of the second power receiving antenna circuit are the same, the power receiving efficiency can be improved by combining the outputs of both circuits.

[0019] (11) In the cutting tool of (10) above, when the main body portion has a rod-shaped shank having three recesses opening into a side surface of the shank and three cover portions covering the three openings of the three recesses, the wireless communication circuit, the first receiving antenna circuit, and the second receiving antenna circuit may be individually accommodated in three accommodation spaces defined by the three recesses and the three cover portions. In this case, by housing each circuit individually in one of three housing spaces, it is possible to prevent interference between the circuits when they transmit and receive radio waves.

[0020] [Details of the embodiment] Hereinafter, preferred embodiments will be described with reference to the drawings. At least a part of each of the embodiments described below may be combined in any manner. [About the cutting system] 1 is a diagram showing an overall configuration of a cutting system in which a cutting tool according to an embodiment is used. In FIG. 1, the cutting system 1 includes a cutting tool 4, a machine tool 2, and a power supply device 6.

[0021] The machine tool 2 is, for example, an NC lathe. The machine tool 2 has a bed 2a and a housing 2b. The housing 2b is disposed above the bed 2a. The inside of the housing 2b is a machining space S. That is, the housing 2b defines the machining space S above the bed 2a.

[0022] In the machining space S, a headstock, a chuck for gripping a workpiece, and the like (not shown) are arranged. Furthermore, a turret 2c is disposed within the machining space S. A cutting tool 4 is held by the turret 2c. The cutting tool 4 is a tool for performing cutting processing on a workpiece held by a chuck. The cutting tool 4 in this embodiment has a sensor and can monitor the state of the cutting processing (the state of the cutting tool 4) and transmit it to the outside.

[0023] The housing 2b has a housing main body 2b1 and an opening / closing door 2b2. The housing main body 2b1 is fixed to the upper surface of the bed 2a. Meanwhile, the opening / closing door 2b2 is movable laterally relative to the bed 2a as shown by the arrow in FIG. The opening / closing door 2b2 is in a closed state in the position shown in Fig. 1. The opening / closing door 2b2 moves laterally from the closed position to an open state. When the opening / closing door 2b2 is in an open state, each element arranged in the machining space S is exposed to the outside. When an operator prepares for machining or removes a machined workpiece, the opening / closing door 2b2 is in an open state. When the door 2b2 is in the closed state, the operator of the machine tool 2 cannot access the machining space S. Therefore, when the machine tool 2 is performing machining, the door 2b2 is in the closed state.

[0024] The power supply device 6 has a function of wirelessly supplying power to the cutting tool 4. The power supply device 6 includes a power transmitting antenna 8 and a control device 10. The control device 10 has a function of controlling power feeding by the power transmitting antenna 8. The control device 10 generates a power feeding signal based on the power fed from the power source 100, and feeds the signal to the power transmitting antenna 8. The power transmission antenna 8 is provided in the machining space S. The power transmission antenna 8 transmits a power supply signal provided from the control device 10 to the cutting tool 4 as a power supply radio wave.

[0025] [About cutting tools] FIG. 2 is a functional block diagram showing an example of the configuration of the cutting tool 4 according to this embodiment. As shown in FIG. 2, the cutting tool 4 has a main body portion 12, a strain sensor 14, a strain sensor 16, a wireless communication circuit 18, a rectenna 20, and a power storage portion 22. The main body 12 has a shank 12a and a cutting tip 12b. The shank 12a is a metal rectangular columnar member held by a turret 2c of the machine tool 2. The cutting tip 12b is a blade that cuts a workpiece by contacting the workpiece. The cutting tip 12b is detachably attached to the end of the shank 12a.

[0026] The strain sensors 14, 16, the wireless communication circuit 18, the rectenna 20, and the power storage unit 22 are provided on the shank 12a. The strain sensors 14, 16 are attached to the shank 12a and detect the state of the cutting tool 4. The strain sensors 14, 16 measure the strain of the shank 12a as the state of the cutting tool 4. The strain sensors 14, 16 include strain gauges, etc. When power is applied to the strain sensors 14, 16 from the charge control circuit 24, the strain sensors 14, 16 provide an output corresponding to the current strain of the shank 12a to the wireless communication circuit 18. The output of the strain sensors 14, 16 indicates the strain of the shank 12a.

[0027] The rectenna 20 has a power receiving antenna 20a and a rectifier circuit 20b. The power receiving antenna 20a receives radio waves from the power supply device 6. The power receiving antenna 20a provides the power of the received radio waves to the rectifier circuit 20b. The rectifier circuit 20b rectifies the power provided from the power receiving antenna 20a, converts it to DC power, and outputs it. The DC power output by the rectifier circuit 20b is provided to the sensors 14, 16 and the wireless communication circuit 18. In other words, the rectenna 20 constitutes a power receiving antenna circuit that receives radio waves for power supply transmitted from a power transmitting antenna 8 provided in the machining space S and outputs DC power. The DC power output by the rectenna 20 is applied to a charge control circuit 24 .

[0028] The charging control circuit 24 has the function of converting the DC power output by the rectenna 20 to a predetermined voltage, controlling the charging and discharging of the storage unit 22, and providing the DC power from the rectenna 20 and the DC power from the storage unit 22 to the sensors 14, 16 and the wireless communication circuit 18. When DC power is provided from rectenna 20, charging control circuit 24 provides DC power to sensors 14, 16, wireless communication circuit 18, and power storage unit 22. When DC power is not provided from rectenna 20, charging control circuit 24 provides the power stored in power storage unit 22 to sensors 14, 16, and wireless communication circuit 18. The power storage unit 22 stores DC power provided via the charge control circuit 24. The power storage unit 22 also discharges the stored power based on the control of the charge control circuit 24. In this embodiment, the power storage unit 22 is a storage battery (secondary battery). The power storage unit 22 may also be a capacitor.

[0029] The charge control circuit 24 also has a function of detecting the remaining amount of electricity stored in the power storage unit 22. The charge control circuit 24 detects the voltage of a line 24a connecting the charge control circuit 24 and the power storage unit 22 as the remaining amount of electricity stored in the power storage unit 22. In other words, the charge control circuit 24 has a function as a sensor that detects the remaining amount of electricity stored in the power storage unit 22. The charge control circuit 24 provides information indicating the voltage of the line 24a to the wireless communication circuit 18. In this manner, the output of the charge control circuit 24 serving as a sensor indicates the remaining amount of charge in the power storage unit 22.

[0030] The wireless communication circuit 18 has a transmitting / receiving antenna 18a and has a function of performing wireless communication with a receiver or the like outside the machining space S. The wireless communication circuit 18 performs wireless communication with the receiver by, for example, Bluetooth (registered trademark). Therefore, the wireless communication circuit 18 performs wireless communication using a frequency band including 2.4 GHz. The wireless communication circuit 18 wirelessly transmits the output of each sensor. The sensor output includes strain information based on the output of the strain sensor 14 and the strain sensor 16, and remaining amount information based on the output of the charge control circuit 24. The remaining amount information is information indicating the remaining amount of electricity stored in the electricity storage unit 22. The remaining amount of electricity is expressed as a numerical value. The temperature information, strain information, and remaining amount information are, for example, stored in the same packet and transmitted at predetermined time intervals. When DC power is provided from the charging control circuit 24, the wireless communication circuit 18 establishes a communication connection with the receiver and starts wireless communication.

[0031] As described above, the cutting tool 4 operates the sensor and also operates the wireless communication circuit 18 based on the power supplied from the power supply device 6, and transmits the output of the sensor.

[0032] Fig. 3A is a diagram showing the external appearance of the cutting tool 4. Fig. 3A is a diagram showing a first surface 4a of the cutting tool 4 as viewed from the front. In the following description, the three mutually orthogonal directions in each drawing are referred to as the X direction, the Y direction, and the Z direction. As shown in Fig. 1, one of the X directions is referred to as the X1 direction, and the opposite direction of the X1 direction is referred to as the X2 direction. One of the Y directions is referred to as the Y1 direction, and the opposite direction of the Y1 direction is referred to as the Y2 direction. One of the Z directions is referred to as the Z1 direction, and the opposite direction of the Z1 direction is referred to as the Z2 direction.

[0033] 3A, the longitudinal direction of the cutting tool 4 is along the X direction. The first surface 4a is one side surface of the cutting tool 4. The first surface 4a is a surface of the cutting tool 4 that is parallel to the XY plane and faces the Z1 direction. As described above, the body 12 of the cutting tool 4 has the shank 12a and the cutting tip 12b. The cutting tip 12b is attached to the end of the shank 12a on the X1 direction side. A cutting face 12b1 of the cutting tip 12b faces in the Y1 direction, and a side clearance face 12b2 of the cutting tip 12b faces in the Z1 direction.

[0034] FIG. 3B is a cross-sectional view taken along line BB in FIG. 3A. As shown in FIGS. 3A and 3B, the shank 12a has a first recess 30 and a lid portion 32. The first recess 30 opens to the first surface 4a. The lid portion 32 is a rectangular plate-shaped member. The lid portion 32 is provided at the opening 30a of the first recess 30. The outer edge of the lid portion 32 is aligned with the inner edge of the opening 30a. The lid portion 32 is fitted into the inner edge of the opening 30a and fixed to the opening 30a. In this way, the lid portion 32 closes the opening 30a. The outer surface 32a of the lid portion 32 constitutes a part of the first surface 4a.

[0035] The first surface 4a has an outer surface 32a of the cover portion 32 and a flat surface portion 34. The flat surface portion 34 is a surface portion of the first surface 4a excluding the first recess 30 and facing the Z1 direction. The flat surface portion 34 and the outer surface 32a are flush with each other. The first recess 30 is recessed in the Z2 direction relative to the flat surface portion 34. The first recess 30 has a rectangular shape with its long side aligned along the X direction when the first surface 4a is viewed from the front. Therefore, the cover portion 32 also has a rectangular shape with its long sides aligned along the X direction.

[0036] The wireless communication circuit 18, the charge control circuit 24, the rectenna 20, and the power storage unit 22 are accommodated in the accommodation space S1. The accommodation space S1 is a space defined by the first recess 30 and the lid portion 32.

[0037] The lid portion 32 closes the opening 30a, thereby preventing coolant liquid and the like from entering the accommodation space S1 during machining. As shown in FIGS. 3A and 3B, the lid portion 32 includes a lid main body 33a, a window portion 33b, and a window cover 33c. The lid body 33a is a rectangular plate-shaped metal member. The outer edge of the lid body 33a is aligned with the inner edge of the opening 30a. The lid body 33a is fitted into the inner edge of the opening 30a and fixed to the opening 30a.

[0038] The window portion 33b is provided in the cover body 33a. The window portion 33b is a rectangular hole that communicates the accommodation space S1 with the outside. The window portion 33b has a rectangular shape with its long side aligned along the X direction. The window cover 33c is a rectangular plate-shaped member and is made of a material such as resin that allows radio waves transmitted and received from the wireless communication circuit 18 and radio waves for power supply to pass through. The outer edge of the window cover 33c is aligned with the inner edge of the window portion 33b. The window cover 33c is fitted into the inner edge of the window portion 33b and fixed to the window portion 33b.

[0039] The gap between the outer edge of the cover body 33a and the inner edge of the opening 30a, and the gap between the outer edge of the window cover 33c and the inner edge of the window 33b are sealed, respectively, thereby preventing the coolant liquid and the like from entering the storage space S1.

[0040] As shown in FIG. 3A, the strain sensor 14 and the strain sensor 16 are provided near the end of the shank 12a in the X1 direction. The strain sensor 14 is provided on the second surface 4b side. The second surface 4b is one side surface of the cutting tool 4. The second surface 4b is a surface of the cutting tool 4 that is parallel to the XZ plane and faces the Y2 direction. A second recess 36 is provided on the second surface 4b side of the shank 12a. The second recess 36 is open to the second surface 4b. The second recess 36 is closed by a sensor lid 38. The strain sensor 14 is accommodated in the accommodation space S2. The accommodation space S2 is a space defined by the second recess 36 and the sensor lid portion 38.

[0041] The strain sensor 16 is provided on the third surface 4c side. The third surface 4c is one side surface of the cutting tool 4. The third surface 4c is a surface of the cutting tool 4 that is parallel to the XY plane and faces the Z2 direction. 3B, a third recess 40 is provided on the third surface 4c side of the shank 12a. The third recess 40 opens to the third surface 4c. The third recess 40 is closed by a sensor lid 42. The strain sensor 16 is accommodated in the accommodation space S3. The accommodation space S3 is a space defined by the third recess 40 and the sensor lid portion .

[0042] The accommodation space S2 and the accommodation space S1 communicate with each other through a communication passage (not shown) formed of a groove or a through hole provided in the shank 12a. Similarly, the accommodation space S3 and the accommodation space S1 communicate with each other through a communication passage provided in the shank 12a. The strain sensors 14 and 16 are connected to the wireless communication circuit 18 and the charge control circuit 24 in the accommodation space S1 by lines passing through the communication passage. These lines supply power to the strain sensors 14 and 16 and transmit the outputs of the strain sensors 14 and 16 to the wireless communication circuit 18.

[0043] [About the layout of each circuit] Fig. 4 is an enlarged view of a main part of Fig. 3A, and Fig. 5 is an enlarged view of a main part of Fig. 3B. Fig. 4 shows a state in which the lid portion 32 has been removed. Moreover, the two-dot chain line L in Fig. 4 indicates the outline of the window portion 33b (window cover 33c) when the first surface 4a is viewed from the front.

[0044] Housing space S1 houses circuit board 45 and rectenna 20. Circuit board 45 and rectenna 20 are arranged side by side along the X direction. Circuit board 45 is arranged closer to the X1 direction in housing space S1. Rectenna 20 is arranged closer to the X2 direction in housing space S1.

[0045] The circuit board 45 includes a board body 46 , a first circuit chip 50 , and a second circuit chip 52 . The first circuit chip 50 and the second circuit chip 52 are mounted on a first surface 46a of the substrate body 46. The first surface 46a is the surface of the substrate body 46 that faces the Z1 direction. The second circuit chip 52 is a circuit chip that includes the charge control circuit 24 . The first circuit chip 50 is a circuit chip that constitutes the wireless communication circuit 18 .

[0046] The first circuit chip 50 has a chip surface 50a facing the Z1 direction. A transmitting / receiving antenna 18a is provided on the chip surface 50a. The wireless communication circuit 18 is composed of the first circuit chip 50 and the transmitting / receiving antenna 18a. The transmitting and receiving antenna 18a includes a substrate and an antenna element mounted on the substrate. The transmitting and receiving antenna 18a is provided near the edge of the chip surface 50a in the X2 direction.

[0047] FIG. 6 is a diagram showing circuit board 45 and rectenna 20 when viewed from the front in the Z2 direction. 5 and 6, the power storage unit 22 is attached to the second surface 46b of the substrate body 46. The second surface 46b is a surface of the substrate body 46 facing the Z2 direction. The power storage unit 22 is connected to a connection terminal (not shown) or the like provided on the substrate body 46.

[0048] As shown in FIGS. 4 and 5, the rectenna 20 includes the power receiving antenna 20a described above and a third circuit chip 56. The third circuit chip 56 is a circuit chip including the rectifier circuit 20b. The third circuit chip 56 is mounted on a first surface 54a of an antenna substrate 54 of the power receiving antenna 20a. The first surface 54a is a surface of the antenna substrate 54 facing the Z1 direction.

[0049] The power receiving antenna 20 a includes the above-mentioned antenna substrate 54 , a pair of antenna elements 58 , and a pair of power feed lines 60 . The pair of antenna elements 58 are conductor patterns of copper foil or the like mounted on the first surface 54a. The pair of antenna elements 58 are rectangular or linear, and extend in a row along the X direction. The pair of feed lines 60 are conductor patterns such as copper foil mounted on the second surface 54b. The second surface 54b is a surface facing the Z2 direction on the antenna substrate 54. The pair of feed lines 60 are provided at positions corresponding to the pair of antenna elements 58 on the XY plane.

[0050] The pair of feed lines 60 and the pair of antenna elements 58 are connected by vias or the like provided in the antenna substrate 54 . The power receiving antenna 20a receives radio waves for power supply by a pair of antenna elements 58, and outputs power from a pair of power supply lines 60. The power from the power supply lines 60 is provided to the rectifier circuit 20b included in the third circuit chip 56.

[0051] Rectenna 20 and circuit board 45 are fixed within accommodation space S1. Rectenna 20 and circuit board 45 may be packaged in a shape that can be fixed within accommodation space S1 and fixed within accommodation space S1 as a package, or may be fixed within accommodation space S1 by a bracket or the like.

[0052] Thus, the shank 12a of this embodiment has a first recess 30 opening to the first surface 4a of the shank 12a and a lid portion 32 covering the opening 30a of the first recess 30, and the first circuit chip 50 (wireless communication circuit 18) and the rectenna 20 are accommodated in the accommodation space S1 defined by the first recess 30 and the lid portion 32, so that the first circuit chip 50 and the rectenna 20 can be positioned on the shank 12a without being exposed to the outside.

[0053] 5, as described above, the pair of antenna elements 58 are mounted on the first surface 54a, and the transmitting / receiving antenna 18a is provided on the chip surface 50a. Therefore, the pair of antenna elements 58 and the transmitting / receiving antenna 18a are disposed opposite the lid portion 32.

[0054] More specifically, the pair of antenna elements 58 and the transmitting / receiving antenna 18a are disposed within the range of the window portion 33b (window cover 33c) when viewed from the front from the first surface 4a, as shown in FIG. Therefore, the pair of antenna elements 58 and the transmitting / receiving antenna 18a are disposed opposite the window cover 33c. As described above, the window cover 33c is made of a material that allows radio waves to pass through. Therefore, the window cover 33c can be prevented from interfering with the transmission and reception of radio waves from the transmission and reception antenna 18a and the reception of radio waves for power supply by the pair of antenna elements 58. Furthermore, the pair of antenna elements 58 and the transmitting / receiving antenna 18a are disposed opposite the window cover 33c, so that radio waves can be appropriately transmitted and received through the window cover 33c.

[0055] Furthermore, in this embodiment, the transmitting and receiving antenna 18a is disposed close to the rectenna 20 (the pair of antenna elements 58). Therefore, for example, compared to a case in which the transmitting and receiving antenna 18a is provided closer to the edge of the chip surface 50a on the X1 direction side, or in which the circuit board 45 and the rectenna 20 are disposed with a space in the X direction, the window portion 33b and the window cover 33c can be made smaller.

[0056] In the cutting tool 4 configured as described above, the strain sensor 14 (strain sensor 16), first circuit chip 50 (wireless communication circuit 18), and rectenna 20 are arranged on the shank 12a in the order of the strain sensor 14 (strain sensor 16), first circuit chip 50, and rectenna 20, along the longitudinal direction (X direction) of the shank 12a from the end side on the X1 direction side. In this case, the strain sensor 14 (strain sensor 16) can be disposed at a location closest to the cutting tip 12b, which is the processing point, and sensitivity can be improved. Also, the rectenna 20 is not disposed between the sensors 14, 16 and the first circuit chip 50 (wireless communication circuit 18), and the sensors 14, 16 and the first circuit chip 50 can be disposed relatively close to each other. As a result, the length of the line for transmitting the output of the sensors 14, 16 to the wireless communication circuit 18 can be shortened, and noise resistance can be improved.

[0057] According to this embodiment, since the rectenna 20 is provided to receive radio waves for power supply transmitted from the power transmission antenna 8 provided in the machining space S, wireless power supply is possible within the machining space S. Therefore, the cutting tool 4 can receive power even during machining, and the outputs of the sensors 14, 16 can be transmitted continuously even if the machining time becomes long. As a result, the state of the cutting process can be appropriately monitored.

[0058] Furthermore, the cutting tool 4 of this embodiment is equipped with a power storage unit 22 that stores the power output by the rectenna 20. Therefore, even if the power supply radio waves from the power transmission antenna 8 are temporarily interrupted or temporarily unable to be received, the power stored in the power storage unit 22 can be used to continue transmitting the outputs of the sensors 14, 16.

[0059] [Modifications] FIG. 7 is a block diagram showing a part of a cutting tool 4 according to a modified example. This modification differs from the above embodiment in that it includes a plurality of rectennas (first rectenna 70 and second rectenna 72).

[0060] In FIG. 7, the first rectenna 70 has a power receiving antenna 70a and a rectifier circuit 70b. The second rectenna 72 also includes a power receiving antenna 72a and a rectifier circuit 72b. Rectifier circuit 70b and rectifier circuit 72b are connected to combining circuit 74. Therefore, the DC powers output by first rectenna 70 and second rectenna 72 are provided to combining circuit 74. The combining circuit 74 combines the power output by the first rectenna 70 and the power output by the second rectenna 72 and provides the combined power to the charge control circuit 24.

[0061] Fig. 8 is an external view showing a part of a cutting tool 4 according to this modified example. Fig. 9 is a cross-sectional view showing a part of a cutting tool 4 according to this modified example. Fig. 8 is a front view of the first surface 4a, and Fig. 9 is a cross-sectional view along the XY plane. As shown in FIGS. 8 and 9, the shank 12a of this example has a fourth recess 62, a lid portion 64, a fifth recess 66, and a lid portion 68 in addition to the first recess 30 and the lid portion 32.

[0062] The fourth recess 62 and the fifth recess 66 are provided side by side in the X direction together with the first recess 30. The fourth recess 62 and the fifth recess 66 are open to the first surface 4a. The fourth recess 62 and the fifth recess 66 are recessed in the Z2 direction relative to the flat surface portion 34. The fourth recess 62 and the fifth recess 66 have a rectangular shape when the first surface 4a is viewed from the front.

[0063] The lid portion 64 is a rectangular plate-shaped member. The lid portion 64 is provided at the opening 62a of the fourth recess 62. The outer edge of the lid portion 64 is aligned with the inner edge of the opening 62a. The lid portion 64 is fitted into the inner edge of the opening 62a and fixed to the opening 62a. In this way, the lid portion 64 closes the opening 62a. The outer surface 64a of the lid portion 64 constitutes a part of the first surface 4a.

[0064] The lid portion 68 is a rectangular plate-shaped member. The lid portion 68 is provided at the opening 66a of the fifth recess 66. The outer edge of the lid portion 68 is aligned with the inner edge of the opening 66a. The lid portion 68 is fitted into the inner edge of the opening 66a and fixed to the opening 66a. In this way, the lid portion 68 closes the opening 66a. The outer surface 68a of the lid portion 68 constitutes a part of the first surface 4a.

[0065] The accommodation space S4 accommodates the first rectenna 70. The accommodation space S4 is a space defined by the fourth recess 62 and the lid portion 64. The accommodation space S5 accommodates the second rectenna 72. The accommodation space S5 is a space defined by the fifth recess 66 and the lid portion 68.

[0066] As shown in FIGS. 8 and 9, the lid portion 64 includes a lid main body 65a, a window portion 65b, and a window cover 65c. The lid body 65a is a rectangular plate-shaped metal member. The outer edge of the lid body 65a is aligned with the inner edge of the opening 62a. The lid body 65a is fitted into the inner edge of the opening 62a and fixed to the opening 62a.

[0067] The window portion 65b is provided in the lid main body 65a. The window portion 65b is a rectangular hole that communicates between the accommodation space S4 and the outside. The window portion 65b has a rectangular shape. Window cover 65c is a rectangular plate-like member and is made of a material such as resin through which the power supply radio waves received by first rectenna 70 can pass. The outer edge of the window cover 65c is aligned with the inner edge of the window portion 65b. The window cover 65c is fitted into the inner edge of the window portion 65b and fixed to the window portion 65b.

[0068] The gap between the outer edge of the lid body 65a and the inner edge of the opening 62a, and the gap between the outer edge of the window lid 65c and the inner edge of the window 65b are sealed, respectively, thereby preventing the coolant liquid and the like from entering the storage space S4. The lid portion 68 includes a lid body 69a, a window portion 69b, and a window cover 69c. The lid portion 68 has a similar configuration to the lid portion 64, and therefore a description thereof will be omitted here.

[0069] The accommodation space S1 and the accommodation space S4 are in communication with each other through a communication passage (not shown) formed by a groove or a through hole provided in the shank 12a. Similarly, the accommodation space S1 and the accommodation space S5 are in communication with each other through a communication passage formed by a groove or a through hole provided in the shank 12a. The first rectenna 70 and the second rectenna 72 are connected to the circuit board 45 in the accommodation space S1 by lines passing through the communication passages.

[0070] Fig. 10 is an external view showing a part of the cutting tool 4 according to this modified example. Fig. 10 shows a state in which the lids 32, 64, and 68 are removed. In Fig. 10, the two-dot chain line L1 indicates the outline of the window 33b. The two-dot chain line L2 indicates the outline of the window 65b. The two-dot chain line L3 indicates the outline of the window 69b.

[0071] In this embodiment, only a circuit board 45 is accommodated in the accommodation space S1. The circuit board 45 of this example includes a fourth circuit chip 53 in addition to a first circuit chip 50 and a second circuit chip 52. The fourth circuit chip 53 is a circuit chip that includes a composite circuit 74.

[0072] As shown in FIGS. 10 and 9, the first rectenna 70 includes the power receiving antenna 70a described above and a fifth circuit chip 76. The fifth circuit chip 76 is a circuit chip including the rectifier circuit 70b. The fifth circuit chip 76 is mounted on a first surface 78a of an antenna substrate 78 of the power receiving antenna 70a. The first surface 78a is a surface of the antenna substrate 78 facing the Z1 direction.

[0073] The power receiving antenna 70a includes the antenna substrate 78 and the antenna element 80 described above. The antenna element 80 is a conductor pattern of copper foil or the like mounted on the first surface 78a. The antenna element 80 is formed in a loop shape and constitutes a loop antenna.

[0074] The second rectenna 72 includes the above-mentioned power receiving antenna 72a and a sixth circuit chip 82. The sixth circuit chip 82 is a circuit chip including a rectifier circuit 72b. The power receiving antenna 72a includes an antenna substrate 84 and an antenna element 86. The configuration of second rectenna 72 is similar to that of first rectenna 70, and therefore will not be described here.

[0075] 10, the transmitting and receiving antenna 18a of the circuit board 45 is disposed inside the two-dot chain line L1. Therefore, the transmitting and receiving antenna 18a is disposed within the range of the window portion 33b (window cover 33c) when viewed from the front from the first surface 4a.

[0076] Moreover, the antenna element 80 is disposed inside the two-dot chain line L2. Therefore, the antenna element 80 is disposed within the range of the window portion 65b (window cover 65c) when viewed from the front from the first surface 4a. Similarly, the antenna element 86 is disposed inside the two-dot chain line L3. Therefore, the antenna element 86 is disposed within the range of the window portion 69b (window cover 69c) when viewed from the front from the first surface 4a.

[0077] In this modification, the window covers 33c, 65c, and 69c are also made of a material that allows radio waves to pass through, thereby preventing the window covers 33c, 65c, and 69c from interfering with transmission and reception of the antennas. Furthermore, the transmitting / receiving antenna 18a and the antenna elements 80, 86 are disposed opposite the window covers 33c, 65c, 69c, so that radio waves can be appropriately transmitted and received through the window covers 33c, 65c, 69c.

[0078] Furthermore, in this modified example, the cutting tool 4 is equipped with a second rectenna 72 in addition to the first rectenna 70. Therefore, for example, by making the receiving frequency band of the first rectenna 70 and the receiving frequency band of the second rectenna 72 different, it is possible to receive power supply radio waves of two frequency bands. Furthermore, if the receiving frequency band of the first rectenna 70 and the receiving frequency band of the second rectenna 72 are the same, the power receiving efficiency can be improved by combining the outputs of both circuits 70, 72. In this modified example, the case in which two rectennas are provided is exemplified, but a greater number of rectennas, such as three or four, may be provided.

[0079] In addition, in this modified example, the circuit board 45, the first rectenna 70, and the second rectenna 72 are individually housed in three housing spaces S1, S4, and S5, so that mutual interference can be suppressed when each circuit transmits and receives radio waves.

[0080] 〔others〕 It should be noted that the embodiments disclosed herein are illustrative in all respects and are not restrictive. For example, in the above embodiment, the lid portion 32 has a metallic lid body 33a and a window cover 33c covering the window portion 33b, and the window cover 33c is made of a material such as resin that is permeable to radio waves. However, for example, the entire lid portion 32 may be made of a material such as resin that is permeable to radio waves. In this case, the cover 32 can be prevented from interfering with the transmission and reception of radio waves from the transmission and reception antenna 18a and the reception of radio waves for power supply by the pair of antenna elements 58. Furthermore, since the pair of antenna elements 58 and the transmitting / receiving antenna 18a are disposed opposite the window portion 33b, radio waves can be appropriately transmitted and received through the window cover 33c.

[0081] In addition, in each of the above embodiments, a strain sensor is used as a sensor to detect the state of the cutting tool 4, but in addition to the strain sensor, a temperature sensor or an acceleration sensor may be used to detect the state of the cutting process (the state of the cutting tool 4).

[0082] The scope of the present invention is defined by the claims, not by the meaning described above, and is intended to include all modifications within the scope and meaning equivalent to the claims. [Explanation of symbols]

[0083] 1. Cutting processing system 2 Machine tools 2a Bed 2b Case 2b1 Main unit 2b2 Opening and closing door 2c Turret 4 cutting tools 4a 1st page 4b Side 2 4c 3rd page 6 Power supply equipment 8. Transmission antenna 10 Control device 12 Main body 12a shank 12b Cutting tip 12b1 Scooping face 12b2 Side relief 14 Strain Sensor 16 Strain Sensor 18 Wireless communication circuits 18a Transmitting and receiving antenna 20 Rectenna 20a Receiving antenna 20b rectifier circuit 22 Power storage unit 24 Charging control circuit 24a track 30 First recess 30a opening 32 Lid 32a Exterior 33a Lid body 33b Window section 33c Window Cover 34 Plane section 36 Second recess 38 Sensor cover 40 Third recess 42 Sensor cover 45 Circuit Board 46 Board body 46a 1st page 46b 2nd side 50 First Circuit Chip 50a Chip surface 52 Second circuit chip 54 Antenna board 54a 1st page 54b 2nd side 56 3rd Circuit Chip 58 Antenna elements 60 Power Supply Line 62 4th recess 62a opening 64 Lid 64a Exterior 65a Lid body 65b Window section 65bb Window 65c Window Cover 66 5th recess 66a opening 68 Lid 68a Exterior 69a Lid body 69b Window section 69c Window Cover 70 First Rectenna 70a Receiving antenna 70b rectifier circuit 72 Second Rectenna 72a Receiving antenna 72b rectifier circuit 74 Synthesis circuit 76 5th Circuit Chip 76a 1st page 78 Antenna Board 78a 1st page 80 Antenna Elements 82 6th Circuit Chip 84 Antenna Board 86 Antenna Element 100 power supply L double dot chain line L1 double dot chain line L2 double dot chain line L3 double dot chain line S machining space S1 Containment Space S2 Containment Space S3 Storage Space S4 Containment Space S5 Containment Space

Claims

1. A main body portion disposed in the machining space of a machine tool, a sensor provided on the main body portion, a wireless communication circuit that transmits the output of the sensor, a first power receiving antenna circuit that receives power supply radio waves transmitted from a power transmission antenna provided in the machining space and outputs power, comprising: The main body portion includes a rod-shaped shank, The shank, a recess that opens on the side surface of the shank, and a lid portion that closes the opening of the recess, The wireless communication circuit and the first power receiving antenna circuit are housed in a housing space defined by the recess and the lid portion Cutting tool.

2. The lid portion is made of a material through which radio waves transmitted and received by the wireless communication circuit and the power supply radio waves can pass The cutting tool according to claim 1.

3. The wireless communication circuit has a transmitting and receiving antenna, The first power receiving antenna circuit has a power receiving antenna, The power receiving antenna and the transmitting and receiving antenna are disposed opposite to the lid portion The cutting tool according to claim 2.

4. The lid portion, a window portion that communicates the housing space with the outside, and a window lid that is made of a material through which radio waves transmitted and received by the wireless communication circuit and the power supply radio waves can pass and closes the window portion The cutting tool according to claim 1.

5. The wireless communication circuit has a transmitting and receiving antenna, The first power receiving antenna circuit has a power receiving antenna, The power receiving antenna and the transmitting and receiving antenna are disposed opposite to the window lid The cutting tool according to claim 4.

6. The power receiving antenna and the transmitting and receiving antenna are disposed close to each other The cutting tool according to claim 5.

7. a second power receiving antenna circuit that receives power supply radio waves transmitted from a power transmission antenna provided in the machining space and outputs power, and a combining circuit that combines the power output by the first power receiving antenna circuit and the power output by the second power receiving antenna circuit The cutting tool according to any one of claims 1 to 6.

8. A main body portion disposed in the machining space of a machine tool, a sensor provided on the main body portion, a wireless communication circuit that transmits the output of the sensor, a first power receiving antenna circuit that receives power supply radio waves transmitted from a power transmission antenna provided in the machining space and outputs power, a second power receiving antenna circuit that receives power supply radio waves transmitted from a power transmission antenna provided in the machining space and outputs power A combining circuit that combines the power output by the first power receiving antenna circuit and the power output by the second power receiving antenna circuit; The main body portion includes a rod-shaped shank; The shank is; Three recesses that open on the side surface of the shank; And three lid portions that close the three openings of the three recesses; The wireless communication circuit, the first power receiving antenna circuit, and the second power receiving antenna circuit are individually accommodated in three accommodation spaces defined by the three recesses and the three lid portions. Cutting tool.

9. A main body portion disposed in a machining space of a machine tool; A sensor provided on the main body portion; A wireless communication circuit that transmits the output of the sensor; A first power receiving antenna circuit that receives power supply radio waves transmitted from a power transmission antenna provided in the machining space and outputs power; Comprising: The main body portion is; A cutting tip; And a rod-shaped shank having the cutting tip attached to an end portion; The sensor, the wireless communication circuit, and the first power receiving antenna circuit are arranged on the shank in the order of the sensor, the wireless communication circuit, and the first power receiving antenna circuit along the longitudinal direction of the shank from the end portion side. Cutting tool.

10. Further comprising a power storage unit that stores the power. The cutting tool according to claim 9.

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